From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01863C433EF for ; Tue, 7 Dec 2021 03:22:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234042AbhLGD0H (ORCPT ); Mon, 6 Dec 2021 22:26:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59104 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233910AbhLGD0F (ORCPT ); Mon, 6 Dec 2021 22:26:05 -0500 Received: from mail-pl1-x629.google.com (mail-pl1-x629.google.com [IPv6:2607:f8b0:4864:20::629]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EE6E8C061746 for ; Mon, 6 Dec 2021 19:22:35 -0800 (PST) Received: by mail-pl1-x629.google.com with SMTP id b11so8432227pld.12 for ; Mon, 06 Dec 2021 19:22:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id; bh=IDve8oEFAh3tm09aSKqqbG9jITENxqwhDiI+qaAmf2g=; b=f96WhxszXDg3XCQzRjBKhVEkoLn8amlNkO4xug1L9k/5SbcC2HgTGw7McJwH58DJAg jIW5pkNktzgJXHc1lxGyi+U4DA0YU6TbBpt/QZqFf+RysaxUrGxH0AJ3XMzD9qhv5Zqy /GpFKmXBUX7kNjzGFCuS12yNF+HalvKvMTKpiRGzSLK5s6zmWiKJtlgMg4XgGB8QaNfB Frg/rcHoVswQtgvCdwqz9PXg7Etup0uHLXSeIPMrfbcYOgpj2NhlWI/1/bEVtgBfWnaV O5pXmEIXCpXfPSY8C1zYrKh2Z3oPTb9LucFG/PPNWus5oTXaVDk0khCj5EmAAvmRL3Gz TWrA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=IDve8oEFAh3tm09aSKqqbG9jITENxqwhDiI+qaAmf2g=; b=PVjrqipsN2GKL/dA3KCZvnnOMuYsH02XGII2/6s0Hd2c+t/QEzZFc5cxmajbxcYpCV pI7n57rsfGnIIAO9IAr4xk62tZGAHqsyFbjPoBqrVLbYKh/keZuVpe/nXafzb8bo25Qc QGaR/mtaFb+TegVivsdeK+NtVYPDkoEct91ICbtjMZYYm6hmqKttI0slFr1/xQmX1yfg l1jVGLxGLKb7XkDI1Pc9nSeEHEBXaiZtSVUeT9htTu/y1WDjIccGVJZyYiLRSt3vmU6j CkVjCszq1Al6DtxkW6T7yvISQMz55dPcfOUvM4SZTCkoLJESflZ8drOKvpgW/ap1TOaK +5Vg== X-Gm-Message-State: AOAM531wUuk16J9l86OBZKgZLWbmmNigw/oG4JAxqQdrb8X6DArInJc3 zigEFN1hR3NB9n9RLngelxo= X-Google-Smtp-Source: ABdhPJxRwjbFyo302IU3D34soi4k1UchQ3L/ZcosJRvIwCAo8xh137yRc6FRdvHhnExWhNSW+SSAvQ== X-Received: by 2002:a17:90a:17ef:: with SMTP id q102mr3375708pja.116.1638847355529; Mon, 06 Dec 2021 19:22:35 -0800 (PST) Received: from monster.mioffice.cn ([2408:8607:1b00:7:82e8:2cff:fed2:80d9]) by smtp.gmail.com with ESMTPSA id o124sm13707624pfb.177.2021.12.06.19.22.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Dec 2021 19:22:34 -0800 (PST) From: xf2017140389@gmail.com X-Google-Original-From: xiaofeng5@xiaomi.com To: akpm@linux-foundation.org, christian@brauner.io Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, zhangcang@xiaomi.com, wangju@xiaomi.com, surenb@google.com, fangzhirong@xiaomi.com, xiaofeng Subject: [PATCH] mm/madvise: break reclaim when lock race Date: Tue, 7 Dec 2021 11:22:02 +0800 Message-Id: <20211207032202.6022-1-xiaofeng5@xiaomi.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: xiaofeng When the process_madvise() system call is being used, it takes mmap_lock and blocks the application from allocating memory, leading to unreasonable delays. This patchset aims to fix it. Signed-off-by: xiaofeng --- mm/madvise.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/madvise.c b/mm/madvise.c index 8c927202bbe6..8f1e325873e0 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -322,6 +322,9 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *pmd, if (fatal_signal_pending(current)) return -EINTR; + if (mmap_lock_is_contended(mm)) + return -EINTR; + #ifdef CONFIG_TRANSPARENT_HUGEPAGE if (pmd_trans_huge(*pmd)) { pmd_t orig_pmd; -- 2.17.1